square.geo

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// Gmsh project created on Mon Mar 22 22:51:51 2021
SetFactory("OpenCASCADE");
//+
Point(1) = {0, 0, 0, 1.0};
//+
Point(2) = {1, 0, 0, 1.0};
//+
Point(3) = {1, 1, 0, 1.0};
//+
Point(4) = {0, 1, 0, 1.0};
//+
Line(1) = {1, 2};
//+
Line(2) = {3, 3};
//+
Line(2) = {2, 3};
//+
Line(3) = {3, 4};
//+
Line(4) = {4, 1};
//+
Curve Loop(1) = {4, 1, 2, 3};
//+
Plane Surface(1) = {1};
//+
Physical Curve("boundary", 5) = {3, 2, 1, 4};
//+
Physical Surface("surface", 6) = {1};